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Energy Saving Renovation Project in northwest China

In a large-sized thermal power generation plant of a power generation group in northwest China, two 330 MW sub-critical thermal power generation units were put into operation in 2005. In 2011, it was decided to implement the frequency conversion renovation project for the feed pump systems that had 20 - 33% of the plant power consumption, in order to improve its operation benefits and reduce its operation losses.

Its Unit #1 was equipped with typical electric feed pump systems with hydraulic coupling regulation. There were also three 5500 kW motors for feed pumps. In such renovation process, the regulation solution of hydraulic couplers was retained (wherein it was necessary to renovate booster pumps, the lubricant pump systems built in hydraulic couplers, and the DCS system for water supply control). During the operation of renovated variable-frequency feed pumps, the aperture ratio of hydraulic couplers was up to 100%. Their operation was fully regulated by the HV variable frequency speed control system. The cooling solution combining air channels and water coolers was cost-effective. After the installation and commissioning of such HV frequency converter, a series of linkage tests and unit RB operation tests were carried out. The results met the design guideline and operation conditions. Therefore, this project was put into operation successfully in October 2012.

The average annual load of this unit was 250 MW. Its annual operation time was approx. 8000h. After the HV frequency converter was put into service, an evaluation on its energy saving effect was conducted within about two months. Compared with the hydraulic coupling regulation, the average energy saving rate was up to 20%. Two variable-frequency feed pumps could achieve the annual power saving of 10,000,000 kWh as expected.

         

Energy Saving Renovation Project in northwest China

      

 

Energy Saving Renovation Project in northwest China

  

 

Energy Saving Renovation Project in northwest China

 

 

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